IPC messages and changes to ResourceLoaderBridge to support resource loading for media

chrome/browser/renderer_host/resource_handler.h

Index: chrome/browser/renderer_host/resource_handler.h
diff --git a/chrome/browser/renderer_host/resource_handler.h b/chrome/browser/renderer_host/resource_handler.h
index 2b843f9b29f8ac22280a70e67b77f63cb7b95358..e0713d97ed368b1f6a8957a2d9dc56fb13cdeb4d 100644
--- a/chrome/browser/renderer_host/resource_handler.h
+++ b/chrome/browser/renderer_host/resource_handler.h
@@ -14,6 +14,11 @@
 
 #include <string>
 
+#include "build/build_config.h"
+#if defined(OS_POSIX)
+#include "base/file_descriptor_posix.h"
+#endif
+#include "base/platform_file.h"
 #include "chrome/common/filter_policy.h"
 #include "net/url_request/url_request_status.h"
 #include "webkit/glue/resource_loader_bridge.h"
@@ -31,6 +36,20 @@ struct ResourceResponseHead
   // Specifies if the resource should be filtered before being displayed
   // (insecure resources can be filtered to keep the page secure).
   FilterPolicy::Type filter_policy;
+
+  // A platform specific handle for a file that carries response data. This
+  // entry is used if the resource request is of type ResourceType::MEDIA and
+  // the underlying cache layer keeps the response data in a standalone file.
+#if defined(OS_POSIX)
+  // If the response data file is available, the file handle is stored in
+  // response_data_file.fd, its value is base::kInvalidPlatformFileValue
+  // otherwise.
+  base::FileDescriptor response_data_file;
+#elif defined(OS_WIN)
+  // An asynchronous file handle to the response data file, its value is
+  // base::kInvalidPlatformFileValue if the file is not available.
+  base::PlatformFile response_data_file;
+#endif
 };
 
 // Parameters for a synchronous resource response.